Design and synthesis of multi-component 18π annulenic fluorofullerene ensembles suitable for donor–acceptor applications
作者:Glenn A. Burley、Anthony G. Avent、Ilya V. Gol’dt、Peter B. Hitchcock、Hamad Al-Matar、Demis Paolucci、Francesco Paolucci、Patrick W. Fowler、Alessandro Soncini、Joan M. Street、Roger Taylor
DOI:10.1039/b309959h
日期:——
A series of trannulene (all-trans annulene) derivatives of [60]fullerene have been prepared by reacting C60F18 with methanetricarboxylate esters that incorporate a range of photoactive functions. All the compounds have the intense emerald-green colour of fullerene trannulenes, characterised by strong bands at ca. 612 and 667 nm. Single crystal X-ray studies show that the packing varies with the nature of the addend, attributable to differing steric effects. UV/vis absorption spectra display transitions of the respective fullerene and addend models, indicating absence of electronic interactions between them in the ground state. These now provide an extensive series for testing photoactive (light-harvesting) properties, with the exceptional properties of having strong visible light absorption. Their exceptional stability is attributed to the 18Ï aromatic circuit, inability to undergo nucleophilic substitution without disrupting this circuit, and a curved cage region that is shielded to reagents by the three bulky addends.
一系列由[60]富勒烯构成的全反式环烯(trannulene)衍生物已通过C60F18与含有多种光活性功能团的甲烷三羧酸酯反应制备而成。所有化合物都呈现出富勒烯环烯特有的深祖母绿色,其特征在于约612和667纳米处的强吸收带。单晶X射线研究表明,由于空间效应的差异,包合物随附加基团性质的不同而变化。UV/可见光吸收光谱显示了各自富勒烯模型和附加基团的跃迁,表明在基态时它们之间不存在电子相互作用。这些化合物如今提供了一大批用于测试光活性(光捕获)性能的系列,其独特之处在于具有强烈的可见光吸收。它们异常的稳定性归因于18π芳香环路,无法在不破坏此环路的情况下进行亲核取代反应,以及由三个庞大的附加基团保护的弯曲笼状区域。